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Bolt-In Brake Master Cylinder Brace That Firms Up the Pedal Feel on the Classic NA Miata
The Radium Engineering RAD20-0843 is a precision-machined brake master cylinder brace designed specifically for the 1989-1997 Mazda MX-5 Miata (NA chassis) equipped with ABS. The factory brake master cylinder on the NA Miata has a known tendency to flex under hard braking, which introduces a soft, vague sensation into the brake pedal that undermines driver confidence. The RAD20-0843 addresses this by bracing the master cylinder directly to the chassis, eliminating unwanted flex and translating more of each pedal input into actual braking force. The result is a firmer, more predictable pedal with improved modulation, which is particularly valuable in track-day and autocross applications where consistent brake feel is critical. Installation requires no cutting or welding and uses only existing mounting points.
Key Features
- Eliminates brake master cylinder flex on the 1989-1997 Mazda MX-5 Miata NA with ABS
- Direct bolt-in installation using existing mounting points, no cutting or welding
- Improves brake pedal firmness and modulation feel
- Precision CNC-machined from aluminum for lightweight, rigid construction
- Designed specifically for ABS-equipped NA Miata
- Radium Engineering quality and fit
Specifications
| Detail | Value |
|---|---|
| Part Number | RAD20-0843 |
| MPN | RAD20-0843 |
| Application | 1989-1997 Mazda MX-5 Miata with ABS |
| Chassis | NA (First Generation) |
| ABS Required | Yes (ABS-equipped vehicles only) |
| Material | CNC-Machined Aluminum |
| Installation | Bolt-in, no cutting or welding |
| Brand | Radium Engineering |
| UPC | Not specified |
What's Included
- 1x Radium RAD20-0843 brake master cylinder brace
- Required mounting hardware
About Radium Engineering
Radium Engineering is a US-based manufacturer specializing in precision CNC-machined fuel system, brake, and engine bay components for performance and motorsport applications. Radium products are known for their precise fitment, clean design, and engineering focus on solving specific performance problems. The brand is widely used in track-day, time attack, and club racing builds across a range of platforms.
Frequently Asked Questions
Does the RAD20-0843 fit the non-ABS version of the NA Miata?
No. The RAD20-0843 is specifically designed for the 1989-1997 Mazda MX-5 Miata equipped with ABS. The non-ABS master cylinder has a different configuration and this brace is not compatible with those vehicles.
What years of Miata does the RAD20-0843 fit?
The RAD20-0843 fits the 1989 through 1997 Mazda MX-5 Miata NA chassis with ABS brakes.
Will I notice a difference in brake pedal feel after installing the RAD20-0843?
Yes. The reduction in master cylinder flex translates directly to a firmer, more linear brake pedal. The improvement is most noticeable during hard braking events, such as at the end of a track straight, where pedal consistency is most important.
Does installation require any modifications to the vehicle?
No. The RAD20-0843 is a direct bolt-in brace that uses existing mounting points on the NA Miata firewall and master cylinder. No cutting, welding, or drilling is required.
Is the RAD20-0843 suitable for a street-driven daily Miata?
Yes. While the RAD20-0843 delivers the most noticeable benefit in performance driving, the firmer pedal feel also improves daily street driving confidence. There is no downside for street use.
Does Radium Engineering include hardware with the RAD20-0843?
Yes. The RAD20-0843 kit includes the necessary mounting hardware for installation.
Is the RAD20-0843 compatible with brake master cylinder upgrades?
The RAD20-0843 is designed to work with the factory ABS master cylinder. Compatibility with aftermarket master cylinder upgrades depends on the specific dimensions of the replacement unit. Contact Radium Engineering for guidance on compatibility with non-OEM master cylinders.
What material is the RAD20-0843 made from?
The RAD20-0843 is precision CNC-machined from aluminum, providing the rigidity needed to brace the master cylinder effectively while adding minimal weight to the vehicle.
Installation Instructions
- Locate the brake master cylinder on the driver-side firewall of the NA Miata.
- Identify the existing mounting points that the RAD20-0843 brace attaches to.
- Position the brace per Radium Engineering's installation instructions, aligning with the designated mounting holes.
- Install the provided hardware finger-tight to allow for position adjustment.
- Confirm the brace is seated correctly against the master cylinder and firewall without binding.
- Torque all hardware to Radium Engineering's specified values.
- Test the brake pedal feel before driving to confirm the brace is correctly installed and the brake system is functioning normally.
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